[pulseaudio-discuss] Arduino Tian issue changing card profile to A2DP with bluetooth headset

[Mimmo]

Arduino Tian (an evolution of Arduino Yun) is a board that has a MIPS 
processor where Linux is runinng. The distribution used is Linino, 
derived from openWRT.

On this board Wifi from Qualcomm and Bluetooth from CSR are embedded.

Software version details:
- kernel 3.18.11
- bluez5 version 5.23
- pulseaudio 6.0
- dbus 1.9

The Headset device is properly connected but using paplay:

root at linino:~# paplay -v -d bluez_sink.5D_43_5A_03_31_EA /root/sample.wav
Opening a playback stream with sample specification 's16be 2ch 44100Hz' 
and channel map 'front-left,front-right'.
Connection established.
Stream successfully created.
Buffer metrics: maxlength=4194304, tlength=352800, prebuf=349276, 
minreq=3528
Using sample spec 's16be 2ch 44100Hz', channel map 'front-left,front-right'.
Connected to device bluez_sink.5D_43_5A_03_31_EA (index: 1, suspended: no).

it start to play the music but without any sound. Trying to change the 
card profile from HSP to A2DP with the command:

pactl set-card-profile 0, a2dp_sink

hangs the board and exit with connection failure: Timeout

trying to trace the code, I noticed that it stops on the call 
stop_thread on module-bluez5-device.c

Can you help me to understand why is hanging changing the profile?

Is it possible to force the default to A2DP instead of HSP?

Following some output:

root at linino:~#
root at linino:~# pactl list cards
Card #0
     Name: bluez_card.5D_43_5A_03_31_EA
     Driver: module-bluez5-device.c
     Owner Module: 17
     Properties:
         device.description = "Marley Chant BT"
         device.string = "5D:43:5A:03:31:EA"
         device.api = "bluez"
         device.class = "sound"
         device.bus = "bluetooth"
         device.form_factor = "headset"
         bluez.path = "/org/bluez/hci0/dev_5D_43_5A_03_31_EA"
         bluez.class = "0x240404"
         bluez.alias = "Marley Chant BT"
         device.icon_name = "audio-headset-bluetooth"
         device.intended_roles = "phone"
     Profiles:
         headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, 
sources: 1, priority: 20, available: yes)
         a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, 
sources: 0, priority: 10, available: yes)
         off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
     Active Profile: headset_head_unit
     Ports:
         headset-output: Headset (priority: 0, latency offset: 0 usec)
             Part of profile(s): headset_head_unit, a2dp_sink
         headset-input: Headset (priority: 0, latency offset: 0 usec)
             Part of profile(s): headset_head_unit


root at linino:~# pactl list sinks
Sink #1
     State: SUSPENDED
     Name: bluez_sink.5D_43_5A_03_31_EA
     Description: Marley Chant BT
     Driver: module-bluez5-device.c
     Sample Specification: s16le 1ch 8000Hz
     Channel Map: mono
     Owner Module: 17
     Mute: no
     Volume: mono: 65536 / 100%
             balance 0.00
     Base Volume: 65536 / 100%
     Monitor Source: bluez_sink.5D_43_5A_03_31_EA.monitor
     Latency: 0 usec, configured 0 usec
     Flags: HARDWARE HW_VOLUME_CTRL LATENCY
     Properties:
         bluetooth.protocol = "headset_head_unit"
         device.intended_roles = "phone"
         device.description = "Marley Chant BT"
         device.string = "5D:43:5A:03:31:EA"
         device.api = "bluez"
         device.class = "sound"
         device.bus = "bluetooth"
         device.form_factor = "headset"
         bluez.path = "/org/bluez/hci0/dev_5D_43_5A_03_31_EA"
         bluez.class = "0x240404"
         bluez.alias = "Marley Chant BT"
         device.icon_name = "audio-headset-bluetooth"
     Ports:
         headset-output: Headset (priority: 0)
     Active Port: headset-output
     Formats:
         pcm


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